| -rw-r--r-- | core/apps/embeddedkonsole/MyPty.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/core/apps/embeddedkonsole/MyPty.cpp b/core/apps/embeddedkonsole/MyPty.cpp index 4b1ae59..c11889e 100644 --- a/core/apps/embeddedkonsole/MyPty.cpp +++ b/core/apps/embeddedkonsole/MyPty.cpp @@ -36,255 +36,255 @@ One can create many instances of this class within a program. As a side effect of using this class, a signal(2) handler is installed on SIGCHLD. \par FIXME [NOTE: much of the technical stuff below will be replaced by forkpty.] publish the SIGCHLD signal if not related to an instance. clearify TEPty::done vs. TEPty::~TEPty semantics. check if pty is restartable via run after done. \par Pseudo terminals Pseudo terminals are a unique feature of UNIX, and always come in form of pairs of devices (/dev/ptyXX and /dev/ttyXX), which are connected to each other by the operating system. One may think of them as two serial devices linked by a null-modem cable. Being based on devices the number of simultanous instances of this class is (globally) limited by the number of those device pairs, which is 256. Another technic are UNIX 98 PTY's. These are supported also, and prefered over the (obsolete) predecessor. There's a sinister ioctl(2), signal(2) and job control stuff nessesary to make everything work as it should. */ #include <qfileinfo.h> #include <qapplication.h> #include <qsocketnotifier.h> #include <stdlib.h> #include <stdio.h> #include <signal.h> #include <fcntl.h> #include <unistd.h> #include <termios.h> #include <sys/types.h> #include <sys/ioctl.h> #include <sys/wait.h> #ifdef HAVE_OPENPTY #include <pty.h> #endif #include "MyPty.h" #undef VERBOSE_DEBUG /* -------------------------------------------------------------------------- */ /*! Informs the client program about the actual size of the window. */ void MyPty::setSize(int lines, int columns) { struct winsize wsize; wsize.ws_row = (unsigned short)lines; wsize.ws_col = (unsigned short)columns; if(fd < 0) return; ioctl(fd,TIOCSWINSZ,(char *)&wsize); } void MyPty::donePty() { // This is code from the Qt DumbTerminal example int status = 0; ::close(fd); if (cpid) { kill(cpid, SIGHUP); waitpid(cpid, &status, 0); } emit done(status); } const char* MyPty::deviceName() { return ttynam; } void MyPty::error() { // This is code from the Qt DumbTerminal example donePty(); } /*! start the client program. */ int MyPty::run(const char* cmd, QStrList &, const char*, int) { // This is code from the Qt DumbTerminal example cpid = fork(); if ( !cpid ) { // child - exec shell on tty for (int sig = 1; sig < NSIG; sig++) signal(sig,SIG_DFL); // attempt to keep apm driver from killing us on power on/off signal(SIGSTOP, SIG_IGN); signal(SIGCONT, SIG_IGN); signal(SIGTSTP, SIG_IGN); int ttyfd = open(ttynam, O_RDWR); dup2(ttyfd, STDIN_FILENO); dup2(ttyfd, STDOUT_FILENO); dup2(ttyfd, STDERR_FILENO); // should be done with tty, so close it close(ttyfd); static struct termios ttmode; if ( setsid() < 0 ) perror( "failed to set process group" ); #if defined (TIOCSCTTY) - // grabbed from APUE by Stevens + // grabbed from APUE by Stevens (see section 9.6, should be page 246) ioctl(STDIN_FILENO, TIOCSCTTY, 0); #endif tcgetattr( STDIN_FILENO, &ttmode ); ttmode.c_cc[VINTR] = 3; ttmode.c_cc[VERASE] = 8; tcsetattr( STDIN_FILENO, TCSANOW, &ttmode ); if(strlen(getenv("TERM"))<=0) setenv("TERM","vt100",1); setenv("COLORTERM","0",1); if (getuid() == 0) { char msg[] = "WARNING: You are running this shell as root!\n"; write(ttyfd, msg, sizeof(msg)); } QString ccmd = "-"+QFileInfo(cmd).fileName(); //creates a login shell execl(cmd, ccmd.latin1(), 0); donePty(); exit(-1); } // parent - continue as a widget QSocketNotifier* sn_r = new QSocketNotifier(fd,QSocketNotifier::Read,this); QSocketNotifier* sn_e = new QSocketNotifier(fd,QSocketNotifier::Exception,this); connect(sn_r,SIGNAL(activated(int)),this,SLOT(readPty())); connect(sn_e,SIGNAL(activated(int)),this,SLOT(error())); return 0; } int MyPty::openPty() { // This is code from the Qt DumbTerminal example int ptyfd = -1; #ifdef HAVE_OPENPTY int ttyfd; if ( openpty(&ptyfd,&ttyfd,ttynam,0,0) ) ptyfd = -1; else close(ttyfd); // we open the ttynam ourselves. #else for (const char* c0 = "pqrstuvwxyzabcde"; ptyfd < 0 && *c0 != 0; c0++) { for (const char* c1 = "0123456789abcdef"; ptyfd < 0 && *c1 != 0; c1++) { sprintf(ptynam,"/dev/pty%c%c",*c0,*c1); sprintf(ttynam,"/dev/tty%c%c",*c0,*c1); if ((ptyfd = ::open(ptynam,O_RDWR)) >= 0) { if (geteuid() != 0 && !access(ttynam,R_OK|W_OK) == 0) { ::close(ptyfd); ptyfd = -1; } } } } #endif if ( ptyfd < 0 ) { qApp->exit(1); return -1; } return ptyfd; } /*! Create an instance. */ MyPty::MyPty() : cpid(0) { fd = openPty(); } /*! Destructor. Note that the related client program is not killed (yet) when a instance is deleted. */ MyPty::~MyPty() { donePty(); } /*! sends len bytes through the line */ void MyPty::send_bytes(const char* s, int len) { #ifdef VERBOSE_DEBUG // verbose debug printf("sending bytes:\n"); for (int i = 0; i < len; i++) printf("%c", s[i]); printf("\n"); #endif ::write(fd, s, len); } /*! indicates that a block of data is received */ void MyPty::readPty() { char buf[4096]; int len = ::read( fd, buf, 4096 ); if (len == -1) donePty(); if (len < 0) return; emit block_in(buf,len); #ifdef VERBOSE_DEBUG // verbose debug printf("read bytes:\n"); for (int i = 0; i < len; i++) printf("%c", buf[i]); printf("\n"); #endif } |